/interpreter/tags/at2-build060407/src/edu/vub/at/actors/net/cmd/CMDProvideService.java
Java | 72 lines | 20 code | 7 blank | 45 comment | 0 complexity | 030b5fa6f3dee6d79ede4a37469f7bee MD5 | raw file
1/** 2 * AmbientTalk/2 Project 3 * CMDProvideService.java created on 22-feb-2007 at 20:24:31 4 * (c) Programming Technology Lab, 2006 - 2007 5 * Authors: Tom Van Cutsem & Stijn Mostinckx 6 * 7 * Permission is hereby granted, free of charge, to any person 8 * obtaining a copy of this software and associated documentation 9 * files (the "Software"), to deal in the Software without 10 * restriction, including without limitation the rights to use, 11 * copy, modify, merge, publish, distribute, sublicense, and/or 12 * sell copies of the Software, and to permit persons to whom the 13 * Software is furnished to do so, subject to the following 14 * conditions: 15 * 16 * The above copyright notice and this permission notice shall be 17 * included in all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 21 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 22 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 23 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 24 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 26 * OTHER DEALINGS IN THE SOFTWARE. 27 */ 28package edu.vub.at.actors.net.cmd; 29 30import edu.vub.at.actors.natives.ELVirtualMachine; 31import edu.vub.at.actors.natives.Packet; 32import edu.vub.at.actors.net.comm.Address; 33import edu.vub.at.actors.net.comm.CommunicationBus; 34 35/** 36 * A CMDProvideService message is sent asynchronously to all connected VMs when 37 * an actor on the sender VM provided a new publication. Connected VMs are notified 38 * of this such that they can match this new publication with local subscriptions. 39 * 40 * SENDER: the VM that provides a new publication 41 * RECEIVER: all connected VMs 42 * MODE: ASYNCHRONOUS, MULTICAST 43 * PROPERTIES: the subscription info: topic and provided service object 44 * REPLY: none 45 * 46 * @author tvcutsem 47 */ 48public class CMDProvideService extends VMCommand { 49 50 private final Packet serializedTopic_; 51 private final Packet serializedService_; 52 53 public CMDProvideService(Packet topic, Packet service) { 54 super("provideService"); 55 serializedTopic_ = topic; 56 serializedService_ = service; 57 } 58 59 public void send(CommunicationBus dispatcher) { 60 dispatcher.sendAsyncMulticast(this); 61 } 62 63 /** 64 * When a remote VM receives the notification, it checks whether any local subscriptions 65 * can be matched with the new published service. 66 */ 67 public void uponReceiptBy(ELVirtualMachine remoteHost, Address senderAddress) { 68 // notify local discovery actor of the new provided service 69 remoteHost.discoveryActor_.event_remotePublication(serializedTopic_, serializedService_); 70 } 71 72}